A chemoenzymatic approach to the synthesis of the stereoisomers of a β-adrenergic receptor antagonist
作者:Clelia Dallanoce、Marco De Amici、Giacomo Carrea、Francesco Secundo、Sabrina Castellano、Carlo De Micheli
DOI:10.1016/s0957-4166(00)00241-x
日期:2000.7
The four stereoisomers of Δ2-isoxazoline 2, a β-adrenergic receptor antagonist structurally related to Falintolol 1, were prepared by an enzyme-catalyzed kinetic resolution of the unsaturated secondary alcohol (±)-7 followed by its cycloaddition to pyruvonitrile oxide. Through this strategy, diastereomeric aminoalcohols (+)-2a/(−)-2b and (−)-2a/(+)-2b were obtained in 99 and 92% enantiomeric excess
Δ的四种立体异构体2 -isoxazoline 2,β-肾上腺素受体拮抗剂结构上与Falintolol 1中,通过不饱和仲醇(±)的酶催化的动力学拆分来制备- 7,随后其环加成丙酮腈氧化物。通过该策略,分别以99%和92%的对映体过量获得非对映体氨基醇(+)- 2a /(-)- 2b和(-)- 2a /(+)- 2b。通过化学相关性将目标化合物的绝对构型分配给环氧化物4a和4b的对映异构体,其立体化学先前已建立。